Proxy Error - Error reading from remote server

[Rodney Hunter]

First, I need to admit that I am not proficient with Linux. We used to have a Linux guy that helped when we ran into issues but he is no longer here.

With that being said, I am attempting to upgrade from version to 2.2.8 to 2.3.3. After completing the update, I get the following error -

"Proxy Error
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /.
Reason: Error reading from remote server"

I am running Python v2, Apache 2.4.18 and Ubuntu 16.04.2.

These are the steps I run to perform the upgrade under sudo credentials -

cd /home/tsdept
wget https://github.com/digitalocean/netbox/archive/vX.Y.Z.tar.gz
tar -xvzf v2.3.3.tar.gz -C /opt
cd /opt/
rm netbox
ln -sf netbox-2.3.3/ netbox
cp /opt/netbox-2.2.8/netbox/netbox/configuration.py /opt/netbox/netbox/netbox/configuration.py
cp /opt/netbox-2.2.8/gunicorn_config.py /opt/netbox/gunicorn_config.py
cd netbox
./upgrade.sh
sudo supervisorctl restart netbox

I appreciate any help!
Thanks

[Brian Candler]

Try setting DEBUG = True in configuration.py, then run netbox under the local debug webserver:

cd /opt/netbox/netbox

python3 manage.py runserver "[::]:8000" --insecure

If it fails to start, you should get a decent error message that you can post here.

If it starts up OK, use a web browser to connect to http://x.x.x.x:8000/ and see if any additional error is generated.

[Rodney Hunter]

Hey Brian,

Thanks for your help. I set DEBUG to true and ran netbox under local debug using python3 and it started with no errors and I was able to access the web with no errors. However, I completed the install using python version 2, so if i try the same command (python2 manage.py runserver "[::]:8000" --insecure) I get the following error

Unhandled exception in thread started by <function wrapper at 0x7f4afa4d32a8>
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/django/utils/autoreload.py", line 228, in wrapper
    fn(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/commands/runserver.py", line 117, in inner_run
    autoreload.raise_last_exception()
  File "/usr/local/lib/python2.7/dist-packages/django/utils/autoreload.py", line 251, in raise_last_exception
    six.reraise(*_exception)
  File "/usr/local/lib/python2.7/dist-packages/django/utils/autoreload.py", line 228, in wrapper
    fn(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/django/__init__.py", line 27, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/usr/local/lib/python2.7/dist-packages/django/apps/registry.py", line 85, in populate
    app_config = AppConfig.create(entry)
  File "/usr/local/lib/python2.7/dist-packages/django/apps/config.py", line 94, in create
    module = import_module(entry)
  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
ImportError: No module named timezone_field

To me, it seems like the logical solution is to switch from python version 2 to version 3. I am not exactly sure how to switch versions.

[Rodney Hunter]

I found in the readthedocs documentation how to migrate to python 3 and it was pretty easy. After that migration, everything is working great again on version 2.3.3.

Thanks for your help! It is very much appreciated!

[Brian Candler]

Glad you got it working.  I use python3 because that's what Ubuntu 16.04+ comes with by default (and I don't want to add python2 into the mix unless necessary), but AFAIK Netbox should still support python2.

I believe you can pass flag "-2" to upgrade.sh to force version 2.